Router loses configuration due to faulty or corrupt NVRAM

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Nov 18, 2009 6:25 PM
Jun 17th, 2009

Core Issue

The router fails to load a previously saved configuration. One of these error messages may be observed:

  • System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
    Copyright (c) 1997 by cisco Systems, Inc.
    Warning: monitor nvram area is corrupt ... using default values
  • Warning: NVRAM size is 0

  • environment checksum in NVRAM failed

  • Router#show startup-config

    %Error opening nvram:/startup-config (Invalid Checksum)

    Router#

Resolution

These error messages usually indicate a hardware failure. To verify, issue the test memory command. This is an example of the command output:

Router#test memory

Test NVRAM card [y/n] ? y

Failed

Issue the write erase command and reload the router. If the issue persists, the hardware will need to be replaced.

When hardware replacement is indicated, perform one of these options:

  • If you have a hardware support contract directly with Cisco for this part, use the Service Order Submit Tool to request a replacement part directly.
  • For warranty service, contact the Cisco Technical Assistance Center (TAC) directly at 1-800-553-2447,  or online by using the TAC Service Request Tool.
  • If your product is not covered by contract or warranty, contact your Cisco partner or reseller to request a replacement part for the hardware component that is causing the issue.

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Posted June 17, 2009 at 10:18 PM
Updated November 18, 2009 at 6:25 PM
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